FILE - This undated aerial file photo provided by Dominion shows the Dominion Liquefied Natural Gas (LGN) facility in Cove Point, Md. A domestic natural gas boom already has lowered U.S. energy prices while stoking fears of environmental disaster. Now U.S. producers are poised to ship vast quantities of gas overseas as energy companies seek permits for proposed export projects that could set off a renewed frenzy of fracking. Expanded More than 20 projects to export LNG are under review by the Energy Department. (AP Photo/Dominion)

FILE - This undated aerial file photo provided by Dominion shows the Dominion Liquefied Natural Gas (LGN) facility in Cove Point, Md. A domestic natural gas boom already has lowered U.S. energy prices while stoking fears of environmental disaster. Now U.S. producers are poised to ship vast quantities of gas overseas as energy companies seek permits for proposed export projects that could set off a renewed frenzy of fracking. Expanded More than 20 projects to export LNG are under review by the Energy Department. (AP Photo/Dominion)